Compilare: user.cpp: In function ‘int build(int, int, int)’: user.cpp:12:45: warning: no return statement in function returning non-void [-Wreturn-type] build(nod*2,st,mij),build(nod*2+1,mij+1,dr);} ^ user.cpp: In function ‘int update(int, int, int, int, int, int)’: user.cpp:49:45: warning: control reaches end of non-void function [-Wreturn-type] aint[nod].tot=aint[nod*2].e+aint[nod*2+1].b;} ^ user.cpp: In function ‘int main()’: user.cpp:51:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hotel.in","r",stdin); ^ user.cpp:52:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hotel.out","w",stdout); ^ user.cpp:54:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&p); ^ user.cpp:57:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&tip); ^ user.cpp:59:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^ user.cpp:62:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^